Cant use 1440x900 in MAcMini  Help ASAP!!!!!!!

I have serious problems using my LCD widescreen display (viewsonic VA1903wb) I already have 3 macminis in my office and any of those 3 can use 1440x900 in a regular basis.
Some times, I start it up and it switches to a 1440x900 (the ideal, clear and crisp graphics resolution for my LCD) but when I restart or shutdown/start or Sleep, the resolution change to 1280x960 or 1400x1050 (normal view streched to the wide ratio)
It *****, because im a graphic designer, and all my work look stretched.
and need help for this problem ASAP!!!!
PS. I have a Cube G4 WITH THE SAME DISPLAY, AND O PROBLEMS, never change the resolution by itself.

Check out this thread:
http://discussions.apple.com/thread.jspa?messageID=5499693&#5499693
Unfortunately it doesn't conclude with certainty, but it seems that Viewsonic has an architecture bug that doesn't allow a host system (Mac mini in this case) to power the I2C bus and EDID-containing ROM that lives inside the Viewsonic. That's a violation of the VESA standard for the plug and display interface. Either take it back for a refund or repurpose it to a PC, which doesn't rely on plug and display in the same ways a Mac does, if at all.
In my experience on these forums, it seems Viewsonic is not a Mac friendly company and I would recommend to anyone with a Mac to avoid them.

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